diff --git a/src/graph_manager.cpp b/src/graph_manager.cpp
index f99d4ed..af79551 100644
--- a/src/graph_manager.cpp
+++ b/src/graph_manager.cpp
@@ -1,6 +1,5 @@
 #include "graph_manager.h"
 
-#include <fstream>
 #include <iostream>
 #include <algorithm>
 #include <cstdlib>
@@ -12,11 +11,6 @@
 #include <unordered_map>
 #include <sstream>
 
-#if __has_include(<filesystem>)
-#include <filesystem>
-namespace fs = std::filesystem;
-#endif
-
 #include "utils/config_expand.h"
 #include "utils/config_schema.h"
 #include "utils/logger.h"
@@ -74,41 +68,6 @@ std::string AffinityKey(std::vector<int> cpus) {
     return oss.str();
 }
 
-bool WriteTextFile(const std::string& path, const std::string& content, std::string& err) {
-    std::ofstream ofs(path, std::ios::binary | std::ios::trunc);
-    if (!ofs.is_open()) {
-        err = "Failed to open file for write: " + path;
-        return false;
-    }
-    ofs.write(content.data(), static_cast<std::streamsize>(content.size()));
-    if (!ofs.good()) {
-        err = "Failed to write file: " + path;
-        return false;
-    }
-    return true;
-}
-
-bool WriteTextFileAtomic(const std::string& path, const std::string& content, std::string& err) {
-    err.clear();
-#if __has_include(<filesystem>)
-    const std::string tmp = path + ".tmp";
-    if (!WriteTextFile(tmp, content, err)) return false;
-    std::error_code ec;
-    fs::remove(path, ec); // best-effort (Windows rename requires target missing)
-    ec.clear();
-    fs::rename(tmp, path, ec);
-    if (ec) {
-        err = "rename failed: " + ec.message();
-        std::error_code ec2;
-        fs::remove(tmp, ec2);
-        return false;
-    }
-    return true;
-#else
-    return WriteTextFile(path, content, err);
-#endif
-}
-
 QueueDropStrategy ParseDropStrategy(const std::string& s, QueueDropStrategy def) {
     if (s == "drop_oldest") return QueueDropStrategy::DropOldest;
     if (s == "drop_newest") return QueueDropStrategy::DropNewest;